Cutting blade and moldboard structure



April 6, 1954 .J. D. NEWKIRK CUTTING BLADE AND MOLDBOARD STRUCTURE Filed July 18, 1950 Fiq- 3 i 1M F"; fl Z Z llll a Patented Apr. 6, 1954 UNITED STATES PATENT OFFICE CUTTING BLADE AND MOLDBOARD STRUCTURE James Dexter Newkirk, Bucyrus, Ohio Application July 18, 1950, Serial No. 174,403

2 Claims. 1

My invention relates to improvements in cutting means and relates more particularly to improved blade or cutting means to be associated with moldbards for road graders, scrapers, bulldozers, terracers, snow plows or the like, and to improvements in mold boards therefor.

In prior art ground-working tool structures of the type aforesaid with which I am familiar, blades or cutting edges are attached to moldboards of such structures by the use of bolts and nuts and, due to the fact that manufacturers of different structures manufacture the same in various sizes and with different spacing of holes in the same, there are in existence several thousand different types of blades.

It is an object of my invention therefore to provide an improved detachable blade or cutting edge for road graders or the like and moldboards therefor wherein assembly or replacement of such means is easily and expeditiously effected;

It is a further object of my invention to provide an improved blade or cutting edge of the above type and moldboard therefor which will be inexpensive and simple in manufacture and highly efficient in use;

Another object of my invention is to provide an improved detachable blade and secondary moldboard which may be used with various type existing structures;

Other objects of my invention and the invention itself will become more readily apparent by reference to the description in which reference will be had to the accompanying drawings, in which:

Fig. l is a front plan view of the blade and moldboard means of my invention;

Fig. 2 is a view taken on the line 2-2 of Fig. 1 and showing the dirt or front side of the blade and moldboard;

Fig. 3 is a rear plan view on the opposite side of the blade and moldboard of Fig. 1;

Fig. 4 is a view taken on the line 4-4 of Fig. 1 and showing the rear face similar to that shown in Fig. 3.

Referring now to the drawings, in all of which like parts are designated by like reference characters, in the figures shown herein, I show a two part blade structure I consisting of the blade ll illustrated in Figs. 1 to 4, inclusive, and the moldboard I2 illustrated in Figs. 1 to 4, inclusive. In said figures, I show a fastening clip l3 which may be aflixed to end notches if provided in the blade H.

The blade I I of my invention is a longitudinally extending scraper blade bevelled at l4 in the conventional manner, the blade preferably being" constructed of a high carbon abrasion resistingsteel, or alloy steel. It is provided with a plurality of upwardly extending, rearwardly inclined, integrally formed tang portions l5 of of the type referred to, or a secondary mold-.

board structure attached thereto, but in any event, shall be of generally rectangular form, and provided with a plurality of slots longitudinally extending and indicated at I8 spaced above the lower edge of said moldboard, said slots l8 being disposed in relative longitudinal alignment.

The tangs of the blade H are adapted to be inserted within an aligned slot in the moldboard structure, as indicated in Figs. 2 and 4 and, when so inserted, a portion of the moldboard, indicated at 20, overlaps a substantial portion of the front or dirt surfaces 2| of the blade, and a portion of the moldboard, indicated at 22, is disposed in lapped relationship to the back surfaces 23 of the blade I I. The fastening clip shown in Fig. 3 is of generally U-shaped construction and is a conventional type fastening, and other suitable clips. etc. could be employed herein in lieu thereof, adapted to secure the end portions of the blade to the moldboard to securely maintain the tongue and slot engagement of the blade to the moldboard and to resist torsional, dragging or lifting effect thereon which might cause said blade and moldboard to tend to separate.

It will be obvious that all tang portions l5 might be provided with fastening means, if desired, similarly to the tang portions l6 and that various type fastening means could be employed in this connection.

Also, that the moldboard l2 could be the conventional type moldboard in which slots similar to those indicated at l8 are added, or a secondary moldboard having the slots [8 preliminarily formed therein and said secondary moldboard could be attached to a moldboard on any existing structure by means of the use of existing bolt connections 24, etc. by providing said secondary moldboard with apertures as shown at 25, adapted to align therewith.

In Figs. 1 to 4, inclusive, it will be noted that 3 I have indicated at I2 a fiat metal portion of either a moldboard to which the secondary moldboard 12 may be attached, or said portion could be an L-beam or other integral means of a scraper, bulldozer, etc.

It will be obvious that the combined m0ld board and blade of my invention may be simply and easily secured together. or the blade detached therefrom in field operation.

Also, it will be obvious that, although I have described my invention in connection with a preferred embodiment thereof, that numerous and extensive departures such as changes in size, material, and fastening means could be made. without, however, departing from the spirit of my invention or the scope of the appended claims.

What I claim is:

1. Means for supporting a work blade, comprising a supporting plate and a blade, the blade being provided with a plurality of upwardly extending tang extensions, the plate being provided with a plurality of longitudinally extending slots, each'said tang extension adapted to be inserted through a said slot in the'plate and the lower portion'of each said tang extension being inclined at an angle to the remainder of the blade whereby the tang portion of the blade is adapted to be disposed in lapped relation rearwardly of said plate, and a portion of said plate is adapted to be disposed in lapped relation rearwardly of said blade, "said lapped portions of the said plate and blade being parallel to each other, generally U-shaped clip attachment means adapted to be associatedwith at least an end plate and blade in'ass'einbled relation.

2. Means for supporting a work blade, comprising a supporting plate element and a blade element, one of said elements being provided with a plurality of upwardly extending tang extensions, the other of said elements being provided with a plurality of longitudinally extending slots, each said tang extension adapted to be inserted through asaid-slot in the, said-other element and the lower portion of each said tang extensions being inclined at an angle to the remainder of the said first named element whereby the tang portion of the said first named element is adapted to be disposed in lapped relation rearwardly of said other element, and a portion of said other element is adapted to be disposed in lapped relation rearwardly of said first named portion, said lapped portions of said other element and said first named element being parallel to each other, generally U-shaped attachment means adaptedto be associated withat least an end one of said tang extensions to securely retain the said other element and the saidfirst named element in assembled relation.

References Cited in the file of this patent UNITED STATES. PATENTS Number Name Date 1,937,243 Pearch Nov. 28, 1933 2,138,150 Flynn Nov. 29, 1938 2,285,039 Low June 2,1942

2,472,892 George June 14,1949

FOREIGN PATENTS Number Country Date 35,655 Denmark June 21, 1927 375,048 France Feb. 27, 1906 

